Some researchers believe that there is no doubt______a cure for AIDS will be found.
| A．whether | B．that |
| C．what | D．which |
Scientists study ____ human brains work to make computers.
| A．when |
| B．how |
| C．that |
| D．whether |
The notice came around two in the afternoon____the meeting would be postponed.(2012•江苏)
| A．when |
| B．that |
| C．whether |
| D．how |
____medicine works in a human body is a question ____ not everyone can understand fully.
| A．How; that |
| B．That; which |
| C．What; which |
| D．What; that |
The media today can draw government’s attention to ____help is really needed.
| A．that |
| B．which |
| C．where |
| D．whose |
The painting is .so valuable that it is difficult to calculate____ its price would be.
A that
B. which
C．what
D.＼